MrNaz
Enlightened
3.7V battery, 880mA
3.7Vf LED
One DD LED from one battery with a 350mA AMC7135 board gives you about 2.5h runtime.
Now, lets say I have 3 LEDs and 3 batteries, configured like in the first diagram here:
http://www.candlepowerforums.com/vb/showthread.php?t=201392
I actually just built this:
http://static.mrnaz.com/tmp/driver_cleverness.jpg
How do you calculate the runtime? I have 3 batteries, and 3 LEDs, so there was a proportional increase in energy use and energy supply, but here I see a total of 880mAh x 3 batteries = 2,640mAh. Current use is still 350mA, so now my runtime is 7.5h? That can't be right, surely?
The same number of LEDs and batteries, connected to one driver each would give a total runtime of 2.5h. So by configuring them this way, I get 3x the runtime for free? I can't see a fault with it, but I have Homer in the back of my mind saying "Lisa, in this house we obey the laws of thermodynamics!".
3.7Vf LED
One DD LED from one battery with a 350mA AMC7135 board gives you about 2.5h runtime.
Now, lets say I have 3 LEDs and 3 batteries, configured like in the first diagram here:
http://www.candlepowerforums.com/vb/showthread.php?t=201392
I actually just built this:
http://static.mrnaz.com/tmp/driver_cleverness.jpg
How do you calculate the runtime? I have 3 batteries, and 3 LEDs, so there was a proportional increase in energy use and energy supply, but here I see a total of 880mAh x 3 batteries = 2,640mAh. Current use is still 350mA, so now my runtime is 7.5h? That can't be right, surely?
The same number of LEDs and batteries, connected to one driver each would give a total runtime of 2.5h. So by configuring them this way, I get 3x the runtime for free? I can't see a fault with it, but I have Homer in the back of my mind saying "Lisa, in this house we obey the laws of thermodynamics!".
